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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90862f25343762bf461d024bb32d0b66fa5f67f08ec498937bd8a69b463a3615' 
  AND token = '4PwWeb5ke2NWG4jvZz3YBzd6S/Dk+cxSQ6uvGzv452w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}